A block of wood is move 30cm along a rough surface. If the mass of the wood is 25kg and the coefficient of friction is 0.8. What is the minimum work done?
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Two force acting on the block force due to gravity and friction force as shown in the figure.
f=μmgcosθ=μ503
Fg=mgsinθ=100sin300=50N
acceration due to force on the block is a
Fg+f=ma
⇒50N+μ503=10a
⇒a=5+53μ
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